Sydney temperatures soared over 40 degrees on Thursday morning but mid-afternoon the city and surrounding suburbs had been struck with thunderstorms, with emergency services dealing with fallen trees and knocked out powerlines.

Incredible photos emerged on social media, with the Sydney suburb of Kurnell dealing with thunder and lightning while Miranda was struck with heavy winds and rain.

The Bureau of Meteorology radar showed that Kurnell, in Sydney's south, was the worst affected area. The coastal suburb was badly struck by storm damage in December, including a tornado that reached speeds of 213km/h.